What physics book(s) uses calculus and has complex problems (undergrad/olympiad level)? Context: I've read "Fundamentals of Physics by Halliday and Resnick" and I found the problems to be fairly straightforward and not so challenging. I am a high school student and I've finished the physics curriculum in my school, also I am studying Calculus 1 and linear algebra. I've experienced that studying calculus-based physics helps me understand calculus and its application.